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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccc9faeaf2113e49f056dd355d5eeaf6a7d51864821e8dfc1f29bf86b88003f' 
  AND token = 'xcyvDLoCT0+tAJQwpNFZ151uI90lVlFPJmvziFT5pR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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