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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db595a713e3900fde40da42b706814b7a1d956b0ef1adf6224ac695f6d6b20c1' 
  AND token = '7CIUK02vhAmNSUC7fs0JuYWCjRKzqWnrHg4QJlIO15A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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