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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2958f33391f34c70954c3eb075a173c3af6c92d4f557c08cb9adb1f483b86bb6' 
  AND token = 'vyNcYT6gCUcmlDXXf9i0Ee2/9qYWTn3DmFR3tll1lZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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