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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20433340047df57633ae47460bd3f79596179da79d45bea4bc05a3cee0dd618c' 
  AND token = 'MssnWIrmz+3AazQx1lzDMMA3iTohUI6w94CyPLyXidY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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