SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97bc7a3594aa754374a511c6b2ecaafa20b14c78859ac67489446f0c80fe817' 
  AND token = 'jSMZ/BggJn+Vt3r5V8BDmPjdkWB2vvUKrruR7bWfUys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}