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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb2361e5caf522bdbfb3da8ecd9b7d28a61b2118c5ca59c10c089e8711e3b08' 
  AND token = 'l3nzHAkjC9ia80C8U1GsW7f0ztLYTA0U6ep4fBRZocM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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