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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e613e0df81f60242cdfafbf5e4d0e641f95bcc1012adb05dd00f6fce82d5de90' 
  AND token = 'Tp6W/N6GtkIxZ4GMQoMzM4qgKEnahz/WPArQQqFCxd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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