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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f854148961ad2a9d1e2e77a22722d55e6e94d5174acc0f2c50ddbc49d941db' 
  AND token = '7Nw2Ji5FSWnLLZW9+pvnXieIwlI0vE602+jEanFaPjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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