  The contributions of the scalar leptoquark doublets into widths of the $K^0_L
\to e^{\mp} \mu^{\pm}$, $B^0 \to e^{\mp} \tau^{\pm}$ decays are calculated in
MQLS model with Higgs mechanism of the quark-lepton mass splitting. The
resulted mass limits for the scalar leptoquarks are investigated in comparision
with those for vector and chiral gauge leptoquarks. It is shown that the scalar
leptoquark mass limits are essentially weaker (about $200 GeV$) than those (a
few hundreds $TeV$) for gauge leptoquarks. The search for such scalar
leptoquark doublets at LHC and the search for the leptonic decays $ B^0 \to
l^+_i l^-_j $ are of interest.
