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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799e775c3c64c665e422448f97ac42877d6161e8695087e6185788e114699082' 
  AND token = 'Jc/3tOW6FXIhGyO80onqrPgKFAE/qGKbvLxV/T6w+C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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