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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13523178c9fa86a25cc85311241e7fb2a48e6e85624ce404df360ee4ee5b1c29' 
  AND token = 'WfgMGx7/jIjVDO9Jg5i++aK/jlSiV6iI3KWdelNtbTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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