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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adefbe0ba924ec9dba005c9e788b6b42169649872e15ae63d58d696800d4046' 
  AND token = 'bxRn9KktT6TbeLkXLvfkJyhtG3mtd3yMbFwRh0OGSTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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