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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da1b239c5132b999660b328e64bb5ce038b96f17fe8a5a3e4ba55a3a5e3bacd' 
  AND token = 'qtlsb547aB7VxbFgSLszLg5okDKJfMvud0Y1+nGL14E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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