Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a0a53909103055087d0e23001254fe82cc1fdb523daf892c83d792becee270' 
  AND token = '7HtllPOKyu+9029lGW9rmzvaTCi5YTKBdaBuoWKhjbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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