SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcbf381ee1884623f1a9196170b455bc6ed82bcb5f6e47230447f375b502724' 
  AND token = 'I0Emw7hnZ2g3WHj2t/yPxpswScZudRsmmYBqPOMfZCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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