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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08530ae15b128c5054e7f2c636fffcea4dbc1ac7e68513c8762fbb30822df31a' 
  AND token = 'EtZ04z5hKYJzPSB6fVPq/F71juLBy2eRgt8zZQym/48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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