  We investigate the strong cosmic censorship conjecture in lukewarm
Reissner-Nordstr\"{o}m-de Sitter black holes (and Mart\'{i}nez-Troncoso-Zanelli
black holes) using the quasinormal resonance of non-minimally coupled massive
scalar field. The strong cosmic censorship conjecture is closely related to the
stability of the Cauchy horizon governed by the decay rate of the dominant
quasinormal mode. Here, dominant modes are obtained in the limits of small and
large mass black holes. Then, we connect the modes by using the WKB
approximation. In our analysis, the strong cosmic censorship conjecture is
valid except in the range of the small-mass limit, in which the dominant mode
can be assumed to be that of the de Sitter spacetime. Particularly, the
coupling constant and mass of the scalar field determine the decay rate in the
small mass range. Therefore, the validity of the strong cosmic censorship
conjecture depends on the characteristics of the scalar field.
