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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da03ca3dce99bdbc34e4c7931ed39348f644118b34ac6e1ffe0aab92084560f1' 
  AND token = '38PbRJmO2+yxvYlO6qQFHsC+eNBOHSPJ3xKn+O3GdwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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