Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debf2c6b450c1532eed182e6ae224551097f5343dd3fd9b35bdc7daee6f73757' 
  AND token = 'xub+XdOWvDRGzus37e6wYzh6AfXpcGgdTnCBDQXaScI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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