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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c6a76c0a6f53eeed57a9302b8308e8f101d6bc5d164beea063a522b681794e' 
  AND token = 'mSz6DEDljoWVG8ZyUQKaf8pwTAcozUtluTv4bMXliok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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