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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6167fa7cd9ee323595a34fe96ea7fd5a78cf5e0798f903fae66a6d35069bae47' 
  AND token = '7e98qFFR+aHqKyjwmj9cbWgwMpc+XFiUXWAemyJAQMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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