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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48add814274e71a66851185178b7c105807715e75896b8306e24e518a6a294a7' 
  AND token = 'CIBCkoc+P++21lIctt0RcTQqZKyJpjHRpquermgqvuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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