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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629297f842aff633bf85df44a55e0dde96c960136389014e6ac3c3ef7e05615c' 
  AND token = '7QsXmSb0s77lK2WYOcKrhbE2eU8jDMdb1JEB3pnr++0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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