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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35628ea69fd934dd447389edaf0063a096f97f5a063d7498fd3851f33bb29840' 
  AND token = '1OK497oCX3pMD59G5gZHUS4uoRzR7a49ZNS+9JaqZkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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