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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23c74c7d38eac0cce08edbfe6f989a6bdd2db6beb5796e9b7312cf4839a2362' 
  AND token = '94fFq8QIeKH1PagFGzMZ+8E6/EL+dO8Z9/iqLlJDLgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}