SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f40746928d5011318671f0d3fa77ba2f3d86b6a857df98dd442a2b36ca3ab7' 
  AND token = 'iFqEkkhv3+HsGyYN7M5Yj2GeT1Hb7EdxPs4r/tglSOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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