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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0267aa443192c03004f4a665c166aadc25d595fba996b16203510f9a22b56ee4' 
  AND token = 'OqO8QtXPk4165yP3ZWaQOjiyqTaykdRD3qN+esLCL0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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