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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28da41e6af002b6afe4cb58b6c55bad905b8d802c56f20b48c6a1d42475c3bad' 
  AND token = 'ebXx5SRiwP35Mncm7QZjJTuVdiwPN0NPZ6qCfAyXJPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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