This act shall be construed to apply to all such taxes whether or not liens for such taxes have been returned for non-payment, or have been filed in the office of the prothonotary of the county, or proceedings for the collection of such taxes have been instituted in any court in said county, or where real property has been sold to a county, city, borough, town, township, school district or poor district at a tax sale or on a tax lien, and the period of redemption has not expired; but this act shall not be construed to apply to cases where real property has been sold other than to a county, city, borough, town, township, school district or poor district at a tax sale or on a tax lien, and where the period of redemption has not expired, but if the taxpayer desires any tax lien or judgment entered of record to be satisfied, it shall be so marked on order filed by the taxing authority or its solicitor upon payment of all costs actually expended by the taxing authority, prothonotary, and sheriff, the taxpayer to be liable for the payment of such costs only, and no other costs to be demandable from him or the taxing authority.