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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7892063689060df665f7b5fd3634af16d9669435e71a4fad94d1b9fd147a8d' 
  AND token = 'IMiBMCzxcFLZqdozYEFFrlTtIoXBca4pBKD8JiOYI2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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