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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6756ac3d5227b9c169be546484c9eb56defb4ce53ac47c0c5767d3b814408c8f' 
  AND token = 'BSsnIv8EUrsoxNoi5ykk5jrgvf9Gy2yAf8B8xXvAUB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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