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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c251ce1eb0e881f4fa77146160a51a0f88eefff8697f2a805f968897c6d4d2' 
  AND token = 'McJAwoygIQ0yLf9fuJ1BtjS1C/825XU6BZGJSIcE4HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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