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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b630d761aef3387d17f8a4261da52bf0f4c940587a3c4bf096a8ff3bf7481e' 
  AND token = 'WhtrBSwSDBLX7VYyLfktb67RsBA8P+FGyqNAPdAgktY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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