SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14578db804ec64f81eec4c37d0c7a4dcd205edda09cfd3da7cff65d947db4ce' 
  AND token = 'kzSxYOgz9lf8Gsj4JGmvPtjPwzYZTVOuM6HB/2N575U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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