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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd910ca9813108d3b13781e7fa01ad6d57a9741eeff7f3f17160fdd9896ab4a32' 
  AND token = 'yTXFyZeZdjChetgl3dfBSiqBTQh5RrvLonbrlq8KuuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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