SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08b6a5c115538668473e7746420b4248cdb3645d920f53f547e62e4f28afa95' 
  AND token = 'oRKPMJcWNZG2xoThAoN8zs7z1IDrjvA+A0genMq1Psw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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