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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e787edc963fc94fc06fb40da85a88884b7505be4678cb3f0c6386f4b766e8776' 
  AND token = 'H68WJO3HNPMYqz9FQQ5cmByfiWdGgv5oMZBAshupYrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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