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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be24be7c656148177ec4f9cc6f62717d29254b2309ee44a7af1b90311849988' 
  AND token = 'l98AdP3pY3ID/B+M8m1sckM/1lDpi+boseXjTj3kTuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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