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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a3164f66725dca100df02af006eaedb1d3a025dba78e9823eb29826b17699b' 
  AND token = 'gDeRgJzeCzr8nwXQuRjx4X/FvDT9ddtGp8Tqoi1H6Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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