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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d38417c8c7f16d2bf942b6fd7e5bb2f52a4c12028af04fd5119d9770a22d6ea' 
  AND token = 'Yzc8tD79Vv2otOg/Liv1zDtEFqYW1aAYCeP5Cye3nOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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