Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9eb9f9635ee945331380f2218d50688d04f5a162093dea50a7fbca2c24a4f4' 
  AND token = 'RBow4QJfvnXe8XLLsrk/f7G5L8nx+wo5DTNgC1+afT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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