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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c10d92610293d095f58f848ac41799de8809e1f0229508dc13b7f3cbd78ead' 
  AND token = 'FBjXDviQaNcsNlX53K/Ujuu/eS+owyi0wEAfEiNw00Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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