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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b29eae4cbb066e3b4331c6c025a82f20a5dce3e5d48db83911809d7c50eac1' 
  AND token = 'SW7Rmm/5WuIp/B5N+/uqK9h4aW27w+SgVfby3jJMp4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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