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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3235a0557c622a0b96c98c8b4cf4ccc29e1bf170abe77f5992319c9893f8646c' 
  AND token = 'AT4lZpjrh0vVJr3CtFvcBe2IHvpzy4FMJ85V7j7vJSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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