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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e61d8d97753a40b313fda9e5595b800f3a1d747f2ad12a62bd8d1d587af8fc5' 
  AND token = '4k6q5/ZmQS1Eu9AqeA6tHUaWhNjTYgOTW4IEZ2sDGWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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