SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'text_out_of_stock', 'sku', 'select_options', 
    'select_options', 'text_out_of_stock', 
    'text_out_of_stock', 'text_out_of_stock', 
    'contact_us_for_price', 'contact_us_for_price', 
    'enter_your_price', 'contact_us_for_price', 
    'sign_in_to_view_price', 'inc_tax', 
    'including_tax', 'you_save', 'you_save', 
    'free_shipping', 'items', 'on_backorder', 
    'availability', 'items', 'on_backorder', 
    'in_stock', 'on_backorder', 'availability', 
    'in_stock', 'on_backorder', 'availability', 
    'quantity', 'quantity', 'text_cart_min_qty', 
    'text_edp_product', 'text_out_of_stock', 
    'sku', 'select_options', 'select_options', 
    'text_out_of_stock', 'text_out_of_stock', 
    'text_out_of_stock', 'contact_us_for_price', 
    'contact_us_for_price', 'enter_your_price', 
    'contact_us_for_price', 'sign_in_to_view_price', 
    'inc_tax', 'including_tax', 'you_save', 
    'you_save', 'free_shipping', 'items', 
    'on_backorder', 'availability', 
    'items', 'on_backorder', 'in_stock', 
    'on_backorder', 'availability', 
    'in_stock', 'on_backorder', 'availability', 
    'quantity', 'quantity', 'text_cart_min_qty', 
    'text_edp_product'
  )

Query time 0.00207

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "23.82"
    },
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "lang_code",
        "name"
      ],
      "key_length": "392",
      "rows_examined_per_scan": 17,
      "rows_produced_per_join": 17,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "20.42",
        "eval_cost": "3.40",
        "prefix_cost": "23.82",
        "data_read_per_join": "6K"
      },
      "used_columns": [
        "lang_code",
        "name",
        "value"
      ],
      "attached_condition": "((`webmarco`.`lang`.`lang_code` = 'en') and (`webmarco`.`lang`.`name` in ('text_out_of_stock','sku','select_options','select_options','text_out_of_stock','text_out_of_stock','text_out_of_stock','contact_us_for_price','contact_us_for_price','enter_your_price','contact_us_for_price','sign_in_to_view_price','inc_tax','including_tax','you_save','you_save','free_shipping','items','on_backorder','availability','items','on_backorder','in_stock','on_backorder','availability','in_stock','on_backorder','availability','quantity','quantity','text_cart_min_qty','text_edp_product','text_out_of_stock','sku','select_options','select_options','text_out_of_stock','text_out_of_stock','text_out_of_stock','contact_us_for_price','contact_us_for_price','enter_your_price','contact_us_for_price','sign_in_to_view_price','inc_tax','including_tax','you_save','you_save','free_shipping','items','on_backorder','availability','items','on_backorder','in_stock','on_backorder','availability','in_stock','on_backorder','availability','quantity','quantity','text_cart_min_qty','text_edp_product')))"
    }
  }
}