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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09016deacd5ce090505f6cae30fd570a6de61241d9fa83c38f96f35b7f9bf4f' 
  AND token = 'wcS964d9VpZZ6HbeIubg4ftudQl336Q6VvZ/LLWCZQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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