SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549fd92a5b8c295d6d0fadea8ca1825acbea4248ffcbf005980793a10baa6996' 
  AND token = 'IUYl4/wLlIpE4k0cmD0BvGMMcHjyUYDKIqg7UBSrJqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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