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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702d27721a61da1c7f45010aaa49a9e1c8cce3977bc8059c802a212875018e02' 
  AND token = '9WDOfJPLBygxkkA31FkTW4v94R1b4JUchwDLsgWQal0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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