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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362a05f9a089a96e04dd5d01452567a85ad81cabe31105df880f45587287fea3' 
  AND token = 'KfZPlz8o/2w67faTDVv7eYvA1FYz5kBr3RSgF+IYxbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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