SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c667d92856554de925de682cf8721473813e009301ef1f593400fc32df1e56' 
  AND token = 'aoZOx5ApMPUtjcleVT+oIgUQz5wHtnw0rRXRkIPL0Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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