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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048f1a6ecf2b8f88c1078f43ba01d7c00e2d1ee8d1a44d9d2565f383f87ae282' 
  AND token = 'yoorhBpx4EtCXs7T6KLzVswjl9lfqMaaqnu5P8AYlRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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