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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ceacea4d0ecdf3f6adf748d55fffb63d36fc63c070d824b64b08c9524e8d51' 
  AND token = 'pbTLx8Ms4MU6q8McQ0dgE+Xs7qpKJjOYbUKh9+bfhYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00399

JSON explain

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