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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406cc6f67fad3816d8d1fd515473306bbde83d729ea1343337d2e33196764716' 
  AND token = 'boFJY5am/pHWHBe3DufwyArKmJScqvG6/U0pSmFdzeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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