Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3ca42e0ee4a4ec41449e6d467ac2f9e664c3d608bea5e2c33b3a96e25f5305' 
  AND token = 'yteThP+mGeuiKU+0h/+KGuFOeMP2YbMcrBgA9wDCCF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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