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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237cb22713b75e44a4cd470ef39bab8679e49eb2020456d556c390fd25b72dba' 
  AND token = 'HoEpFnN9f4Ooro4Yy1rb1kYGI9pLNO3ununc8Yw6PAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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