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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9527868e46bc7f2b77a62537422b3096b611f48ced7433d6285b83413eee73' 
  AND token = 'K9b97ogdfhlV8BtcI41prRBkoKEiCR9Nxgpic4DUN3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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