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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b93ff0bec2665bb4ba60934329f2a52063a74777074258997c673a92392e5bf' 
  AND token = 'A5+rX3Ix8aX7zXtn/3+HlhuTWiQTbk7YZ9LjfJdmpf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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