Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16234da9781ba495b57e848fcb9605093c886a19a53c014ef0b9f108b18ab5f' 
  AND token = '40BpYdzRA39ee7DNoHlXk+D37K9lD+4Ji9b3KExYRQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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