Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3ed4f41c2deb173d20f811987b5adbd90e5f2cd41b6b8485112e282e33b992' 
  AND token = 'tpd7J7i8n3ecx1MZ8qaVK14UMREfoUzI6muv+B7OKDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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