Okla. Stat. tit. 21, § 51.2

Except as provided in Section 51.1a of this title, no person shall be sentenced as a second and subsequent offender under Section 51.1 of this title, or any other section of the Oklahoma Statutes, when a period of ten (10) years has elapsed since the completion of the sentence imposed on the former conviction; provided, the person has not, in the meantime, been convicted of a felony. Nothing in this section shall prohibit the use of a prior conviction for physical or sexually related child abuse as a prior conviction for second and subsequent offender purposes if the person is presently charged with a felony crime involving physical or sexually related child abuse.