Xamarin android Sqlite.net C# how to convert synchronous query to async task

I've got a method for my xamarin android app that checks a sqlite db for login credentials. I'm fairly new to async tasks and was wondering how to change the method below to an async method.

I know I can change the call to the method easily enough with await and changing the calling method to an async relay command but how do I change the query method?

    public static bool CheckLogin(string userName, string password)
    {
        bool valid = false;
        string dbPath = Path.Combine(documentsPath, "..", dbName);
        using (var conn = new SQLite.SQLiteConnection(dbPath))
        {
            try {
                var command = conn.CreateCommand("select * from tblUsers where nLogin = ? and nPassword = ?", userName, password);
                //currentUser = command.ExecuteScalar<User>();
                var user = conn.Query<User>("select * from tblUsers where nLogin = ? and nPassword = ?", userName, password);
                if (user.Count>0)
                {
                    valid = true;
                }
            }
            catch(Exception ex)
            {
                throw ex;
            }
        }
        return valid;
    }

Any help would be appreciated.