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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce006dedca4afd11244897cb245748c0433fad8e7943580ca30366144c710186' 
  AND token = 'SfT3wM4bvDjLKstMVJn3YLCpTv3ZU6ZQeWUUgi2OWok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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