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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8279d8b63d264417c2844eed999542142142bdb72d30f6fc43f4c7ef23d5699b' 
  AND token = '3vpgiadhuQ3oMfM1fuUgChjwB67s+e+SDB61u8jDwGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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