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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e97cee16f697fea9e87b809e3b395cea064f22fa45859823adc979a9e9b102' 
  AND token = '1aI9HEM4q3y1SDVE0XN3PXUCf7Gk4hUTCmH1hELkLo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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