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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5068482a3226a4d7c22f04430144c09456eb29b7431405ce3d245df2434af478' 
  AND token = '79p/jhTHMl3WMWUSyDiv0ie/lYDi3ay+eeBk+tSv40I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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