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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a416ec9f16f5b6fb2d9040769ab35312319a6e9f5359fe7278cd2750b68ea39' 
  AND token = '9XBwpjyySG/asoS7RBUB/ZuD2FNjWdTD425B1dNRJLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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