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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0775a4aaaeddecab13d2a4925fde8a7775933d8ebce590b91b9353674f0ab350' 
  AND token = 'K0xEes+AxsIPyEQmOIackeeK1D8ZOCcIHoFPuFGg+RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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