SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b4d0ac2d96ee512dc45d68496f1ebe9ca226ed836e3f7fe9d561e7fd9e0d78' 
  AND token = '5dbUlpVsQDWG/NcSUcpD4PKbJj6+tMg13pN/E4/2MfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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