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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99c1f1b95846b43831d51e81fe4b479ec414a436d3bbedd02971b209905ff24' 
  AND token = 'pH9BurEgW4pIq63HjEgO/QPwm2RfXJ/UdpfRkA6dCSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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