Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338bea5dc88d0d44fa924860ac3b4b303a880c97b6ddefe2f1eca621d122c6c6' 
  AND token = 'pPkGTTOByumetq2DmBq/JYrfexG6yf/GIeUbVuWlRpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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