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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b087de5657366af792d65fe1d38e55ce27b8096f8f16c15aced9f1a7beeec7' 
  AND token = 'Z778FZO96NsZYgx74yGCO9qOpyXZlBfbkce1JOAbsL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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