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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c13f45cd6cd5d9752acc315fae41760609d112e4e8d5dbe86d1f7a2da43bd26' 
  AND token = 'pWll5vTbsYicmgHTvMupyI/Ez4n21QWAgD/5LnBSQSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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