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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ec161b568d16f2aaf2b964b846098ba3587d3954d3c8f231eef7665fd726c5' 
  AND token = 'Kra73DK7ISknkPXJO1/5TqMQkRc/0UMYgYeuEIBuez8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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