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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20950d462354fbf9a8a9659c780026f15dd6942a6039c176b0d3f048d44dfd19' 
  AND token = 'bYxnH68KXy6ofjntP58N4fsHKKEjbX3WeWl5ZgD7RjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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