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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542a8e25f2d0d671303ef4936e7e4fe760abb6e627909c2d042c2f28479aa798' 
  AND token = 'TYU+SGNbd3qBWAugy2RMTk2NlO8GnVjFYH8rPaFpCxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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