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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5534158770971e925af0ee5d6786dde3a835f4d53a5440d5656220a3077d599a' 
  AND token = '5gdfByXbovG92WyZz+AEZ6K4l7vYz2BbDI7rQMdGcCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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