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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52786b62a2488078454c06af86fa993c7b91de6cc5a499e44e7e265ed27dd16' 
  AND token = 'ZhnOIEusC4W8xk8na8tPBDlmS0/mT+W1EsoZGWkdiDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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