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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009cf768203f4386d1aa8a857131a6515765baf7dd1b80137a312bf53f87c0e4' 
  AND token = '24k5xrAaSx0QBIkXdBO59b8YYhZ6Pu5lJQM6vmD0BKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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