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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be679e167e579bcf221c8a07530befd921ee0d3309254cafa9730706bdfa528' 
  AND token = 'C9W4Z2sU4lekDeIYDkk8z8r/m3cLG03Ca+8U9LsgZeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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