CROSS JOIN (
        SELECT cols.column_id
        FROM [sys].[columns] AS cols WITH (NOLOCK)
        WHERE cols.object_id = OBJECT_ID('dbo.MyHistoryTable')
            AND cols.name IN (
                'Col1',
                'Col2',
                'Col3',
                'Col4',
                'Col5',
                'Col6',
                )
        ) AS cols

IF EXISTS (
        SELECT 1
        FROM dbo.MyHistoryTable WITH (NOLOCK)
        RIGHT JOIN SomeThing AS ct ON [MyHistoryTable].[MyHistoryTablePK] = ct.[MyHistoryTablePK]
        CROSS JOIN (
            SELECT cols.column_id
            FROM [sys].[columns] AS cols WITH (NOLOCK)
            WHERE cols.object_id = OBJECT_ID('dbo.MyHistoryTable')
                AND cols.name IN (
                    'Col1',
                    'Col2',
                    'Col3',
                    'Col4',
                    'Col5',
                    'Col6',
                    )
            ) AS cols
        WHERE (
                ct.SYS_CHANGE_CONTEXT IS NULL
                OR ct.SYS_CHANGE_CONTEXT <> CONVERT(VARBINARY(128), @someVarHere)
                )
            AND CHANGE_TRACKING_IS_COLUMN_IN_MASK(cols.column_id, ct.SYS_CHANGE_COLUMNS) = 1
            AND ct.SYS_CHANGE_OPERATION = 'U'
            AND (
                EXISTS (
                    SELECT 1
                    FROM dbo.[MyHistoryTable] AS t1 WITH (NOLOCK)
                    INNER JOIN (
                            SomeOtherStuffHere
                    WHERE t1.MessagePK = [MyHistoryTable].MessagePK
                    )
                )
        )
    SELECT @myVar = 1;