Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc03910f97cb3ec922681d8fed0d5f473bd495370f9088835482114753977a79' 
  AND token = 'hFxyBVcdTCjQ4UDnsrAzMrSfiDIrMxwskrBlJo9TpcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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