SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf8e09ddbfa3a80a5d8b6efef2c478902145d03a7fe6bc257f07acda9e68417' 
  AND token = 'QYjBfgH+wndZuMDBn/H8vnei+EvY7RKRi+B2vXmuHgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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