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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873a18fcc077d60ac2ed88fa6dc7e4817461fe2b1491c4b5846c265b831fa488' 
  AND token = '4Y8+1IJjl5pKXj0KEXe8n8/edBiME3UzblO7xj1AfcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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