Mo. Rev. Stat. § 443.020
Where heretofore such a deed has been executed containing such assumption or recitals, which might be claimed to fasten such mortgage or deed of trust or other encumbrance as a vendor's lien upon land other than that specifically covered by such mortgage or deed of trust or other encumbrance but in which the intention to create such vendor's lien is not clearly set forth, then such vendor's lien shall not be held to have been created, nor shall it be enforced, unless the party claiming or who might claim same shall, within two years after the indebtedness secured by such vendor's lien shall become due, file suit in the proper court against the owner of such land and against other parties shown by the public records of the county to be interested in said land, to ascertain and adjudge the existence of such vendor's lien and its priority as to other encumbrances or liens, and to foreclose such vendor's lien.
§ 443.020, RSMo