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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403eaa5ac513b7d1eefefbd0d58918dac55ba9d8d49e9258f8774f1a9ea126b8' 
  AND token = 'tL6/14QmWOd1RI30b0GlQsjcRBgdPK19/f3qtdXhgX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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