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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b35784b0764f86ec4bf79a37dc30743378e029c36b2b042a7f03dd3cf1bfc84' 
  AND token = 'mj5Y36onxipCfM5d9ceoYA9my1Cn6vNUOW6uhyEcwUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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