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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474e115b9f677c3d6fdefb91a56f793fa4d7b04d9dde1cc071b42400b2611729' 
  AND token = 'D5UDJhtUGVXwZIHXLJs7xZfnr8d6AxikDIB7ZkECWO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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