SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d2ed84c607a7236d47cd3104e0de125d93fa827954f03a540a7b88a6f15369' 
  AND token = 'qrLKQLhYCJlczGRYREoD2GRdjdEFpHAKvul1Gm/4NIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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