SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2965304098b870f7051fd4d44ad74135761ccd1a9c322bf7b7d8c9af228bdd48' 
  AND token = '7Gp+ZSHbF+ll/XZTPSucmVA5aUv93W43qafUEg3vN1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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