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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b9ec8a2bdcc2c04166baa9ca92648673a36dd1abaa5f72c030948c76c05112' 
  AND token = 'H8qALJHZwIfJciGUHqtMlsOqiwpq+QXuHp0wuO+q918=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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