SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6e596955fa07e523ee80d79ecc150bd78c55e5095a52c970f14a0838cd04a3' 
  AND token = '9wbOx856LosulqtQikbnNb5baHvpOUnh/K2xabys+3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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