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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2348f744c2a063f230abbbc720e3628ee11f772b4041c99bbfc5b6bbacc72fcb' 
  AND token = 'LwXnA2sQL7cYmZx4g0/tZrPLYRBKsLRmYfdN1FWdRzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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