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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4176b857ca294e50f0833d79467402321e6481d28c2f010b3098ff7791f5a96b' 
  AND token = 'Sl5pncXVvh8PW7Fer5OnDx0HYqRfbEaJV4R9C3XeMdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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