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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fdb2d9e3a3ec2cf7ba04fb7aeb47fe0891046b044bc59a9e8c19bfda6dc622' 
  AND token = 'nTdnB9Cwk1Tj8AKzckJm39MZXskNPa+n7vcFGicE+Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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