SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb870229f5d6edfbef6ac50b451f721db15cd15d8126f09e097f82fad9b3b4e7' 
  AND token = 'uXG4G9wmaonzPvYXbjzYEAgd77+JV39mJQXb9SGwcOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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