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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b548b5ff902d2a9891973a06bf9ea48306102e7d7b3e308206b6b0f4ff02450' 
  AND token = 'zntxvz5Y+szbeAJawm84Kf0PrTvbWjWO4UjhPoNHC7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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