SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99250e572d2db7ad4945c9d50c511fd35a4af2d743b58890f4a261a1c0b429e' 
  AND token = 'xq2PL+fUpqARsnSizjz8t40Rbh5J11wEwQrNKzrIDFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables