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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a62cec34d38418b8df0be6d92c41deb1423605d08ed60438f5dd920eedaa646' 
  AND token = 'gzbV3FsIVPuH8Vw0MZACcFJpBC49jJgQd8NKfHBOHLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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