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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab1e1044b143d90f345853ae40512b740ed45028cf93b75e74ba8e66b36e74f' 
  AND token = 'iPxwe9CIUKSILcgf8cRFvXtTQDaWt1EenuX92LSWgx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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