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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477cb60b70c3ac437b38396389009fbfaf26a1c064b1356897250f68e3e38b9b' 
  AND token = 'nNbQ0GCjs5GzcDAQOWGpOKMbK1h/J1CGqjjzvX8a6yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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