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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f713433bb7884ba1c7c1067bfdc2cc7d713035f6c0ad3bff7d785d124c0e4fd2' 
  AND token = 'HX3O2tGmeXQrcu2ln54Q+FfvGY5WsWdo8yR10vqyifA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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