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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1ae911d538219c47b2a9f0f4bddb1760fc43e4e23ddfad4d8d8c448bdc5483' 
  AND token = 'OJpON3uNNNwkoM2waoKUOyF5QX/H7TTtpuhL6kZx8Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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