SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f854fef64d7e09c06be94562f90508977859128cddec7bbf7ef1f691aaf8453' 
  AND token = 'hVn8XK4BlgT/Rh/s33nQBm+4cq6GmyJEvS1J2tgX0dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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