Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543ef50fee3a744d54f12eb18f8a90dbfde5fd0e3f09d90b35f408a80ba483b4' 
  AND token = 'JPRushY9dKCcUveqcIq2SAIbr7JqvHy29tZUEIkzui4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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