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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2addc2d8100dccb3c27214284b7443020bee014129f1293ee0eca6ef2e76e9af' 
  AND token = 'mf9kY6aP4mNn/J9Ztw8s5rHax4qANl6SdeT45VQ121o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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